Probably a problem with the sites' certificates. Check your Windows DATE and TIME and TIME ZONE to see if they are correct.
hi gemma, i have a similar problem, did you get yours fixed, if so what was it?Hi guys,
I have AVG anti virus that updated yesterday and now sites that I use everyday for work are coming up with message 'your connection is not private' . I'm not great with computers but have tried to fix it with online guides but now its blocking them the only site I can get onto is facebook. I've had to use my phone to write this because it won't let me on this site either
Hoping someone can help quick